An arrangement for the cooling of computer data centers. Further disclosed are articles-of-manufacture having these formulations applied thereon, and the use of PBBBr as a flame retardant for application on a substrate. This enables the enhancement of freedom degree and so on in circuit designing according to conditions. The control and power source module may be configured to accommodate a variety of wearable configurations for patient convenience and comfort. In addition, the present invention provides labeled 3-substituted-6-aryl pyridines, which are useful as probes for the localization of C5a receptors. The protrusions are plastically deformed toward the side faces and the end face has a second width which is wider than the first width, so that the bolt-hole cap has sufficient strength to keep the top thereof flushing the top of the rail.